CHERRY VINTAGE AUDIO / objets d'art (Since 2014) 

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Page 2 Vintage Stereo Receivers ~ Tuners ~ Amps

Nakamichi PA-7

Nakamichi PA-7

Nakamichi PA-7 

('88-'89)  200 WPC  SOLD

Obtained locally from the estate of the original owner, this Nakamich PA-7 stereo amp is in perfect cosmetic, fully serviced and fully operational.  Besides being a seriously heavy brute at 60 lbs, the PA-7 is a combination of industrial design in its most beautiful form and function.

The PA-7 delivers  a minimum of 200 watts per channel, uses no overall negative feedback (a Nelson Pass trademark), and boasts the Stasis section, which consists of a low-power voltage amplifier coupled to the current mirror bootstrap output stage to do all the heavy lifting required for high-power output.

(NOTE: For those who may be curious why the original Nakamichi PA-7 was only available for one year and then replaced by the PA-7II, read "The original PA-7 back story" below)

From Tone magazine:
"Back in 1989, when Stereo Review featured the PA-7, writer Julian Hirsch measured the PA-7’s output at 253 watts into an 8-ohm load, 400 watts into a 4-ohm load, and 650 watts into two ohms. A quick look under the hood reveals why.

A large 700 VA toroidal transformer and a bank of power supply capacitors totaling 132,000 µf proves the PA-7 means business. Such a setup made the PA-7 a perfect choice for demanding loudspeakers and, like the Threshold Stasis amplifiers, it ended up in many systems based around electrostatic speakers or Magnepans.

As a single-ended amplifier, the PA-7’s rear panel is sparse, with a pair of RCA input jacks, an IEC socket for your power cord of choice—little did Nakamichi engineers know that in the 21st century, power cords would cost much more than the original price of the PA-7)—and relatively standard binding posts for speaker output"

Original PA-7 back story:
Most vintage HiFi collectors know that Nakamichi made its name on the very best quality home audio cassette decks in the late 1970s. So they had cash to burn, and wanted to become a major player in the high end audio market, which was dominated by US designers and manufacturers.  So what do they do?…  They recruit Nelson Pass (of Threshold) as a “hired gun” and combine his designs and circuit topology with their deep pockets and efficient production techniques.  The result?…  What is essentially a Threshold power amplifier but way better looking and less than half the price.  

They were supposed to just license his STASIS technology, which combines the benefits of Class A amplification without the drawbacks (runs very hot = very low reliability) into a hybrid Class A/Class AB power amplifier with optical bias.  Well, they didn’t just license STASIS.  Rather, the first generation of the PA-7 is a direct copy of the Threshold amp.  A lawsuit ensues, then Nakamichi releases the PA-7II with an altered design providing 25 more watts per channel and a higher price tag.  But everyone knew then and knows now that the original PA-7 was, “the one to get”.  


Basic specs:

Power output: 200 watts per channel into 8 ohms
Frequency response: 20Hz to 20kHz
THD: 0.1%
Dimensions: 17.1"W x 8"H x 16.5"D
Weight: 60 lbs


About Nakamichi...
Nakamichi was founded in 1948 by Mr. Etsuro Nakamichi, starting from a small research institute in Tokyo, Japan that provided R&D for major brands, government entities, universities and organizations. Since then, it has established itself as a trusted creator of high-quality audio products, such as the Nakamichi 1000, the world's first 3-Head cassette deck. Nakamichi's product lines are driven by an intense scientific curiosity, the passion for audio, and commitment to uncompromising quality and performance.

The Nakamichi Shockwafe represents a fundamental disruption in home entertainment. We have successfully blended plug-and-play simplicity with high-end surround performance. Our suite of hybrid soundbar systems allows you to enjoy a cinematic experience at home, with minimum effort. To date, the Nakamichi Shockwafe has been rated the best Dolby Atmos soundbar by both audio critics and users.


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Adcom 5400

Adcom 5400

Adcom 5400 

stereo power amp   ('97-'07)  200 WPC @ 4 ohms  $500

In excellent cosmetic and operating condition, this Adcom 5400 stereo power amp is conservatively rated at 125 watts per channel into 8 ohms and a whopping 200 watts per channel into 4 ohms.  Proving just how popular this powerful and reliable amp has been, it had an incredible production run of ten years.

Basically, any speakers having a nominal impedance down to 4 ohms can be connected to, and easily be driven by the GFA-5400. It can drive these low impedances at more than adequate power levels with no difficulty.
The GFA-5400 is "polarity correct" and does not invert phase. That is, any positive going signal at its input will appear as a positive going signal at its output. The GFA-5400's connection to speakers are made through two high quality, five-way, gold plated binding posts located on the rear panel. These terminals will accommodate either bare wire, tinned wire, terminal pins, spade lugs or banana plugs, both single and dual. 

Features:
~Precision matched MOSFETs used throughout the signal path.
~Over 50,000 µF of power supply filter capacitance with low ESR for greater reserve capacity.
~Low number of gain stages improves signal reproduction accuracy.
~The custom toroidal power transformer provides better regulation and greater peak current capability.
~High quality, gold plated binding posts.
~Independent thermal overload and distortion LED's for each channel.
~Gold plated RCA jacks.
~Large internal heatsinks for greater cooling capability of output devices.
~Heavy gauge, anodized aluminum front panel.
~Powder coated, baked chassis and top cover for greater durability.
~Cooling vents on top cover for greater efficiency and cooler operation while driving low impedance loads.

Basic specs:
Power output: 125 watts per channel into 8 ohms
Frequency response: 10Hz to 20kHz
THD: 0.18%
Dimensions: 5.5"H x 17"W x 14.8"D
Weight: 26 lbs

Adcom GFA-545-II

Adcom GFA-545-II

Adcom GFA-545-II

stereo amp  ('91-'92)   *100 WPC     $400

This Adcom amp is in excellent cosmetic and operating condition. 

The GFA-545-II stereo amplifier is a simple, sleek black box with it's only exterior design in the form of a grooved section on the upper half of the front face.   

A minimum of controls: on/off rocker switch and LED indicator, a brace of multi-way binding posts and gold-plated inputs. The only other distinguishing characteristics are three warning lights, two for 'instantaneous distortion alert' to warn you of excessive THD, IM, slew-induced distortion or clipping, and a light to indicate the awakening of the thermal protection circuit.  

*Rated at a conservative 100 WPC (8 ohms) the honest rated maximum output at 1 kHz into an 8 ohm load is about 128 watts at 121.1 V AC power input at 0.1% THD.

The 545/II has a triple Darlington output stage, a large potted toroidal transformer and large, high-grade power supply filter capacitors to provide stability with awkward loads.  Large heat sinks and adequate ventilation helps to keep it cool at all times. The output section contains 12 discrete transistors in Class AB operation.

The GFA-545-II operates quietly...no noise other than the mechanical sound of the rocker on/off switch engaging. 

Basic specs (amp):
Power output: 120 watts per channel into 8 ohms
Frequency response: 10Hz to 20kHz
THD: 0.04%
Dimensions: 5.5"H x 17"W x 12.2"D
Weight: 25 lbs



About Adcom...
ADCOM started in the 70s. Their first offering wasn’t amplifiers but phono cartridges. They were no ordinary cartridges; however, they were extraordinarily musical "moving coil" designs that extracted a lot of information from a record groove. These products were so successful that other companies asked them to begin making cartridges for them, too! And so, they became a manufacturer!

Early Electronics... ADCOM's first electronic product, the groundbreaking GFA-1 power amplifier, appeared in December 1979. It was substantially more powerful than most of its competition at 200 watts per channel and was one of the first "high current" designs available. . Again, it was an affordable and standout performer. Critical response was phenomenal and the GFA-1 became the "hot ticket" amplifier of its day, as did the successor GFA-1A.

The GFA-1 and GFA-1A were followed by a new group of matching components: the GFA-2 power amplifier, the GFP-1 preamplifier, and the GFT-1 tuner. These were also unique products. The GFA-2 power amp boasted 100 watts per channel and used high-speed output transistors and dual power supplies. The GFP-1's low-noise design won a lot of praise from record lovers and the evolutionary GFP-1A added the convenience of ADCOM's innovative dual recording/listening source selectors.

ADCOM, making you fall in love with your speakers since 1980s. ADCOM has always succeed in delivering quality sound. Being music enthusiast, they always try to achieve the best of sound they can get out of any speakers. ADCOM engineering has made mastered in developing innovative products, best class performance and great value for money. The sound of ADCOM is bold, clear which results is clean instrument sound and vocal quality.


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Pioneer SX-6

Pioneer SX-6

Pioneer SX-6 

('81-'83)  45 WPC   $275

In excellent cosmetic condition and fully operational, this under-appreciated (and unrecognizable) Pioneer SX-6 stereo receiver doesn't get much love.  It just doesn't "look" like a Pioneer (thanks to the industry-wide redesign during the digital 80's.)  When digital arrived, most of the wood and chrome slowly disappeared due to the enormous cost of retaining market share (competition) and the bean counters who shaved every penny they could.
It has been retrofitted with a beautiful teak timberwood case simply because the  "typically boring" look of the digital receivers in the 80's was a turn-off to most who missed the days of the wood-enhanced designs of the 70's.  

Introduced in '81, the SX-6 is very conservatively rated at a bare minimum of 45 watts per channel    It was part of Pioneer's "Champaign/Gold" series.  Thankfully, it still has a phono output stage and the usual "normal" inputs/outputs as all the other vintage receivers of the 70's.  Essentially, this Pioneer is a rock solid unit that's nearly impossible to break.  It's a steady and relatively powerful unit that takes on any speakers you throw at it.  It doesn't care about ohms!

The Champagne series from Pioneer marked the turning point from cool products to computer controlled gizmo receivers but at least it was before the beginning of the end when Pioneer (and the rest of them) turned to black plastic and home theatre.  

Essentially, using all the latest buzz words of the 80's they promoted the SX-6 as a "computer-controlled", fully synthesized and digitally controlled receiver.  However, it's still a quality built unit that also features their "non-switching amplifier" technology that was normally reserved for the higher end Pioneer receivers.  It yields a very low THD of 0.009. 

Yeah..."Computer Controlled" (it says in the left top corner of the faceplate). Roland was using those very words on its percussion machines at the time, the famous TR-series of which TR-808 would become the absolute legend. Everybody wanted YOU (the consumer) to know that logic and memory were a large part of your products, whether it was done well or not. Or course, the technology was so marginal that the baby steps might not actually matter, still the door was wide open to the future...

Specs: 
Power Output: 45 Watts Per Channel Into 8 ohms
Frequency Response: 5Hz To 100kHz
THD: 0.009%
Dimensions: 16."W X 5"H X 14.5"D
Weight: 18 Lbs


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Rotel RSX-1057 

(2007)  100 WPC (stereo)   $500 (includes remote & manual)

Obtained locally from the original owner, this Rotel RSX-1057 is a well built beast in perfect cosmetic and operating condition.
In stereo mode it punches out a minimum of 100 watts per channel.
It comes with the original, fully operational factory remote and original owner's manual.

From a quick glance at its specifications, Rotel’s new RSX-1057 stereo or surround sound receiver might seem like just another entry in this very crowded component category. Yet, the RSX-1057 distinguishes itself from the competition during actual use with an overbuilt power supply that delivers the extreme voltage and current required during those explosive soundtracks so prevalent in today’s movies.

The high current amplifier section puts a full 100 watts RMS per channel in stereo and 75 watts per channel with all five channels driven simultaneously from 20 Hz to 20 kHz with no more than 0.05% THD!
In the real world, this is far more power than you’ll find in other products that provide only two-channel ratings. Of course, superb power supply design helps here as does careful parts evaluation and selection. But, that’s simply part of Rotel’s Balanced Design heritage.

Are you concerned about future audio/video needs? The RSX-1057 is HDMI ready now with two HDMI inputs and one HDMI output (version 1.1) to connect your A/V components to the latest generation video displays with 1080p capability.

Will you be moving your system to a larger environment, or considering an eventual move to full 7.1 surround capability? The RSX-1057 features an option that provides for the simple addition of a two-channel amplifier to expand your home theater options to full 7.1 should you desire it.

Rotel hasn’t forgotten convenience either. The RSX-1057 provides analog and digital connections for up to seven additional components. The RSX-1057 even allows you to re-label inputs, assign inputs, perform advanced bass management and equalize channels.

Advanced microprocessors from Crystal Semiconductor handle Dolby Digital, Dolby Digital EX, DTS, DTS ES Discrete and Matrix, DTS 24/96, DTS Neo:6 and Dolby Pro Logic II X decoding and provide several music modes for your enjoyment, too. Three component inputs and internal video transcoding let you see the best picture possible regardless of your source.

The RSX-1057 is also for custom installations. There’s an RS-232 interface, multi-room, multi-source with composite video, three assignable 12-volt trigger outputs, discrete on/off remote control command codes, rear panel IR inputs, and a detachable AC power cord. A fully programmable remote control is standard.


Specs:
Power output: 100 watts per channel into 8 ohms (stereo)
Surround output: 75W (front), 75W (center), 75W (rear)
Frequency response: 10Hz to 120kHz
THD: 0.09%
Speaker load impedance: 8 ohms minimum
Digital inputs: coaxial, optical
Video Connections: HDMI, component, composite, SVHS
Dimensions: 17.5"W x 6.4"H x17"D
Weight: 38 lbs
Included accessories: RR-1060 remote control



Rotel RX-504

Rotel RX-504

Rotel RX-504 

(1979)  40 WPC   $425   (completely restored and recapped)

In absolutely excellent cosmetic and operating condition, this Rotel RX-504 has been *fully restored and recapped.  The sleek design of the 504 features Rotel's distinctive front faceplate window shape that set them apart from all other receivers of the 70's and three meters (Left/Right power meters and a single tuning meter.)  The 504 does not have the typical wood cover but, instead, slides into a four-sided walnut veneer case.   
*(NOTE:  The restoration included:
~replacement of L/R channel output transistors
~Replacement of faulty differential pair IC
~Reset voltage regulator with new heat sink compound
~New emitter resistors
~New electrolytic caps for main filter caps, power supply, main amp, phono amp, tone amp
~Adjusted idle bias current and DC Offset
~Power meters calibrated
~Alignment for AM and FM tuners
~New LED dial lamps
~Clean/lube all controls and switches


Originally rated at a minimum of 40 watts per channel into 8 ohms, after the recap, the unit now puts out closer to 52 watts per channel (8 ohms) without distortion.  At 4 ohms, it was rated at about 44 WPC but now hits closer to 56 watts per channel without distortion.

Released in 1979, the design of the Rotel *DC series of receivers (including the RX-404, 504 & 604) was considered a major leap forward as they battled the stiff competition among the other Japanese electronic manufacturers in the late 70's.  While Rotel had always been widely respected for the high quality of their integrated amps, they decided to push the design envelope further with the introduction of their DC receiver lineup.  They succeeded.  
*NOTE: While it's confusing to explain, the difference between late 70's DC amp circuitry vs earlier technology can be that earlier amplifiers had capacitors connected directly to the speakers. The later amplifiers have filter capacitors that are not connected to the speakers. 


Basic specs:
Power output: 40 watts per channel into 8Ω (stereo)
Frequency response: 5Hz to 60kHz
THD:  0.08%
Dimensions: 17" x 13.2" x 4.53" (Length x Width x Height)
Weight: 18 lbs


About Rotel...
One of our personal favorite brands, Rotel is a family-owned Japanese manufacturer of hi-fi audio and video equipment: home theater, amplifiers, compact disc players, etc.  Tomoki Tachikawa, a Taiwanese Japanese, founded Rotel in Tokyo in 1957 but their origins date back to the early '50s, when the company began distributing Sylvania television sets throughout Japan. 

In 1961, Rotel became part of the Japanese electronic manufacturing boom, focusing on core engineering values and listening tests. In the '80s, Rotel established an alliance with Bowers & Wilkins loudspeakers and exclusive distribution networks in North America and Europe. In 1993, Rotel launched the Michi line, a more exclusive line of amplifiers.

Rotel has filled an interesting niche in audio for at least the past fifty years. Think of it as a mass market manufacturer – with many of the economies of scale that confers – which focuses more on the specialist audio market. It's no giant Sony or Samsung, but nor is it a small 'cottage industry' maker with tiny sales numbers. Instead, it treads a carefully chosen path down the middle, in-between these two extremes. Resulting in the professionalism of products made by companies that produce in massive quantities, with the attention to detail in design and manufacturing that true hi-fi specialists can offer.
With maybe only a few exceptions, Rotel designed and built all their gear directly in-house.  Because of that, they were able to control costs, eliminate "middle men" and establish strict control quality.


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